scholarly journals Characterisation of Mn0.63Zn0.37Fe2O4 powders after intensive milling and subsequent thermal treatment

2017 ◽  
Vol 49 (4) ◽  
pp. 455-467 ◽  
Author(s):  
Nebojsa Labus ◽  
Zorka Vasiljevic ◽  
Obrad Aleksic ◽  
Miloljub Lukovic ◽  
Smilja Markovic ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Oxidation Kinetics ◽  
Ball Mill ◽  
Planetary Ball Mill ◽  
Subsequent Thermal Treatment ◽  
Reduction Processes ◽  
Air Atmosphere ◽  
Subsequent Heating ◽  
Milled Powders

Commercial Mn-Zn powder (Mn0.63Zn0.37Fe2O4, 93 wt. % and Fe2O3 7 wt. %) was milled 0.5, 1, 2 and 4 hours in a planetary ball mill. The goal was to observe intensive milling influences on oxidation and reduction processes that will happen during subsequent heating. Powders were characterized with XRD, SEM and particle seizer. Subsequent heating was monitored on TGA/DTA in an air atmosphere. After compaction of the milled powders, sintering was also performed in a dilatometric device. Sintered specimens were characterized micro structurally with SEM on a fresh breakage. Obtained differential TGA diagrams suggest intensive changes during prolonged milling of the oxidation kinetics on heating. Ferrite powders changed with milling as well as with second run heating were characterized to enable determination of the potentially best ratio of milling and heating to be applied to obtain the desired microstructure.

scholarly journals Synthesis of dense nanometric MoSi2 through mechanical and field activation

2001 ◽  
Vol 16 (5) ◽  
pp. 1439-1448 ◽  
Author(s):  
R. Orrù ◽  
J. Woolman ◽  
G. Cao ◽  
Z. A. Munir
Keyword(s):  
Crystallite Size ◽  
Electric Current ◽  
Ball Mill ◽  
Planetary Ball Mill ◽  
Plasma Synthesis ◽  
Product Phase ◽  
Spark Plasma ◽  
Spark Plasma Synthesis ◽  
Nanometric Size ◽  
Milled Powders

The effect of mechanical and field activation on the synthesis of dense nanometric MoSi2 was investigated. Powders of Mo and Si, milled separately or comilled in a planetary ball mill, were reacted in a spark plasma synthesis (SPS) apparatus under different electric current conditions. Milled powders reacted faster and required less current than unmilled powders. Mixtures of powders which were milled separately (to nanometric size) reacted in the SPS to produce micrometric α–MoSi2. Similar results were obtained for samples comilled to produce nanometric reactants which did not contain detectable amounts of the product phase. When products form during milling, they contain both the α and β modifications of MoSi2. The product after the SPS reaction was nanometric MoSi2 with a crystallite size of 140 nm.

scholarly journals Enhancing lithium leaching by mechanical activation

2018 ◽  
Vol 19 (45) ◽  
pp. 44-48 ◽  
Author(s):  
Nader Setoudeh ◽  
Ataollah Nosrati ◽  
Nicholas J Welham
Keyword(s):  
Mechanical Activation ◽  
Calcination Temperature ◽  
Ball Mill ◽  
Hot Water ◽  
Planetary Ball Mill ◽  
Isothermal Heating ◽  
Water Leaching ◽  
Air Atmosphere ◽  
Mass Ratios

The lithium (Li) bearing minerals lepidolite and spodumene were mixed with different mass ratios of Na2SO4 and mechanically activated by milling in a planetary ball mill for 5 h. The milled samples were studied using thermogravimetry under an air atmosphere up to 950 ºC. Isothermal heating of the milled samples was undertaken in a furnace at temperatures of 700 ºC and 800 ºC for 1 h. Hot water leaching of the calcines indicated that increasing the calcination temperature had a significant effect on the dissolution of lithium. The leaching of lithium from lepidolite was notably higher than that from spodumene.

Computer Simulation of Mechanoactivation Process in the Planetary Ball Mill: Determination of the Energy Parameters of Milling

2000 ◽  
Vol 8 ◽  
pp. 603-608 ◽  
Author(s):  
E.V. Shelekhov ◽  
Victor V. Tcherdyntsev ◽  
Leonid Y. Pustov ◽  
S.D. Kaloshkin ◽  
I.A. Tomilin
Keyword(s):  
Computer Simulation ◽  
Ball Mill ◽  
Planetary Ball Mill ◽  
Energy Parameters

Computer Simulation of Mechanoactivation Process in the Planetary Ball Mill: Determination of the Energy Parameters of Milling

2000 ◽  
Vol 343-346 ◽  
pp. 603-608 ◽  
Author(s):  
E.V. Shelekhov ◽  
Victor V. Tcherdyntsev ◽  
Leonid Y. Pustov ◽  
S.D. Kaloshkin ◽  
I.A. Tomilin
Keyword(s):  
Computer Simulation ◽  
Ball Mill ◽  
Planetary Ball Mill ◽  
Energy Parameters

Fast, solvent-free and highly enantioselective fluorination of β-keto esters catalyzed by chiral copper complexes in a ball mill

2017 ◽  
Vol 19 (7) ◽  
pp. 1674-1677 ◽  
Author(s):  
Yifeng Wang ◽  
Haojiang Wang ◽  
Yidong Jiang ◽  
Cheng Zhang ◽  
Juanjuan Shao ◽  
...  
Keyword(s):  
Ball Mill ◽  
Copper Complexes ◽  
Solvent Free ◽  
Planetary Ball Mill ◽  
Keto Esters ◽  
Solvent Free Conditions

A fast and highly enantioselective fluorination of β-keto esters catalyzed by diphenylamine linked bis(oxazoline)-Cu(OTf)2 complexes under solvent-free conditions has been developed using a planetary ball mill.

Control of the photoluminescence properties of single-walled carbon nanotubes by alkylation and subsequent thermal treatment

2015 ◽  
Vol 51 (70) ◽  
pp. 13462-13465 ◽  
Author(s):  
Yutaka Maeda ◽  
Yuya Takehana ◽  
Michio Yamada ◽  
Mitsuaki Suzuki ◽  
Tatsuya Murakami
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Treatment ◽  
Single Walled Carbon Nanotubes ◽  
Photoluminescence Properties ◽  
Single Walled Carbon ◽  
Subsequent Thermal Treatment ◽  
Walled Carbon Nanotubes

Alkylation and subsequent thermal treatment of SWNTs induces a new bright PL peak in the NIR region.

Thermal stability and miscibility of co-evaporated methyl ammonium lead halide (MAPbX3, X = I, Br, Cl) thin films analysed by in situ X-ray diffraction

2018 ◽  
Vol 6 (24) ◽  
pp. 11496-11506 ◽  
Author(s):  
Paul Pistor ◽  
Thomas Burwig ◽  
Carlo Brzuska ◽  
Björn Weber ◽  
Wolfgang Fränzel
Keyword(s):  
Thin Films ◽  
Thermal Stability ◽  
Thermal Treatment ◽  
Phase Evolution ◽  
X Ray Diffraction ◽  
Crystalline Phases ◽  
X Ray ◽  
Subsequent Thermal Treatment ◽  
Lead Halide

We present the identification of crystalline phases by in situ X-ray diffraction during growth and monitor the phase evolution during subsequent thermal treatment of CH3NH3PbX3 (X = I, Br, Cl) perovskite thin films.

Sign in / Sign up

Export Citation Format

Share Document